Method for eliminating direct current switch power supply output high-frequency grain wave using instantaneous parallel compensation technique
A DC switching and power output technology, applied in the field of electricity, can solve problems such as increasing filter parameters, restricting the application of DC switching power supplies, and increasing switching frequency, etc., to achieve the effects of eliminating high-frequency ripples, reducing manufacturing difficulty, and reducing capacity
Inactive Publication Date: 2008-09-03
WUHAN UNIV
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Problems solved by technology
However, considering factors such as switching loss and overall machine cost, it is not possible to increase the switching frequency or filter parameters indefinitely.
Therefore, there are always high-frequency ripples in DC switching power supplies, which seriously restrict the application of DC switching power supplies in a wider range.
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[0019] figure 1 Shown is the instantaneous parallel compensation principle circuit diagram of the present invention. At the output end of the DC switching power supply, the filter inductance L of the LC filter circuit 1 Connect an auxiliary compensation inductor L in parallel 2 , VD 1 Current i to filter inductor L1 Provide freewheeling path, C is filter capacitor, R is equivalent load. U s1 Is the input voltage of the filter inductor, U s2 It is the auxiliary input voltage to compensate the inductance. In this embodiment, the filter inductance L is taken 1 And compensation inductance L 2 The two inductances are equal, that is
[0020] L 1 =L 2 =L (1)
[0021] From figure 2 In the schematic diagram of the compensation waveform of the instantaneous parallel compensation principle shown, i L1 It can be seen that the current i of the filter inductor L1 Is fluctuating, which requires compensation for the inductance L 2 Provide compensation current i L2 To offset i L1 Fluctuations. ...
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The invention provides a method for eliminating output high-frequency ripple of DC switch power by using the instantaneous parallel compensation technique. At the output end of the DC switch power, an auxiliary compensating inductance is in parallel connection with a filtering inductance of an LC filter circuit, and the HF pulse transformer of the DC / DC converter in the DC switch power is changed into a multiple winding transformer or an auxiliary transformer is in is in parallel connection with the HF pulse transformer of the DC / DC converter in the DC switch power, a set of auxiliary sources are generated, which allows the current fluctuation direcion of the compensating inductance is opposite to that of the filtering inductance, so as to realize the instantaneous parallel compensation, one of the current fluctuations of the compensating inductance and the filtering inductance is increased, the other is decreased, so as to mutual counteract with each other and allow the output load current to have no ripple, thereby eliminating output high-frequency ripple of DC switch power. Because the current output of the switch power supply is jointly undertaken by the compensating inductance and the filtering inductance, the preparing difficulty of single electric inductance is reduced, and every transformer or winding transformer jointly undertake the output current or power without obviously increasing the transformer capacity or volume.
Description
Technical field [0001] The invention relates to a method for eliminating the output high-frequency ripple of a DC switching power supply, in particular to a method for eliminating the output high-frequency ripple of a DC switching power supply by instantaneous parallel compensation technology, which belongs to the field of electricity. Background technique [0002] Accelerator excitation power supply and radar power supply and other precision equipment require high-performance DC regulated power supply, especially requiring ultra-low ripple. Therefore, high-performance linear DC power supplies are often used in low-power applications, and DC switching power supplies must be selected when efficiency issues are involved in medium and high-power applications. Therefore, ultra-low ripple is one of the development directions of DC switching power supplies. The main reasons for the output ripple of the switching power supply are the low frequency fluctuation of the input power supply (...
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IPC IPC(8): H02M1/14
Inventor 张国安刘开培
Owner WUHAN UNIV